Argentine composer and pianist Ariel Ramirez is widely acclaimed throughout South America for his unique synthesis of popular and liturgical styles. The Misa Criolla, based on South American folk music, is a setting of the traditional Mass texts, in Spanish, to the accompaniment of a variety of Andean instruments. Missa Luba, which adapts traditional Congolese melodies and rhythms to the Latin texts of the Mass, has been described by its creator, the missionary Father Guido Haazen, as a collective improvisation. It includes a prominent and exciting part for African percussion instruments. The Sanctus is also well known for its inclusion in the soundtrack to the 1960s cult film If.